Parker Repro Loose Screw
 

The repro I use to shoot clays frequently has a screw that is continually getting loose. It is the smaller screw immediately in front of the trigger guard bow. I tighten it as much as I feel I dare and it still comes loose. It is a double trigger gun if that makes any difference. Why? Suggestions?

a little dab of thread locker should cure it. But don't use the permanent type.





.

That would also have been my suggestion. Loctite makes a "Red" and "Blue", and I can't remember which is the one with less strength. Any good autoparts store will have both, and know which is which.
As I recall, Carquest has their own, and they are also red, and blue, but Something reminds me they are the opposite from Loctite brand.

a small dab of your wifes finger nail polish will work good for loose screws also...it is fairly easy then to break screw loose if it is needed...charlie

Pretty sure its blue that would allow you to be able to remove it again.. Had to use some on my Garands rear site.

Kirk is correct.

Locktite BLUE is temporary. Locktite RED is permanent.

Thanks for the loctite solution. However, I was as much interested in the "why" it keeps loosening. Is there something out of sorts internally that is working that screw? If so, maybe it can be corrected.

Is the slot properly timed when you tighten it down?

Yes, the screw is perfectly timed when tight.

It is likely a matter of harmonics on recoil.